Question

Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining ?
(i) Au
(ii) Cu
(iii) Na
(iv) K
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (iii) and (iv)

Answer 1

Answer: the correct option is A.

Explanation:

Refining is the process of purifying crude metal.

Electrolytic refining is the general method deployed to refine metals based on the phenomenon of electrolysis.

Here, the crude metal is made the anode and the metals sulphate solution acts as the electrolyte.

When current is passed, the metal ions from the electrolyte deposit at the cathode in the form of a pure metal and the impurities settle down below the anode in the form of anode mud.

Metals such as Au and Cu deploy electrolysis method while Na,K cannot be isolated by reduction of their oxides or other compounds as they are very strong reducing agents.

Answer 2

Answer:

option "A" is the correct answer

Explanation: